Improvement in hydraulic elevators



,ZSh'eets-Sheet'l. T. STEBINS.

. HYDRAULIC-ELE-VATOR.

No.172,896 Patented Feb. 1, 1876.

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N.PE|'ERS, PHOTO`LIYHOGRAPNER. WASHINGTON, D. G.

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UNITED STATES vPA'rrnvr rrron.

TIMOTHY STEBINS, BOSTON,'MA SSACHUSETTS.

IMPROVEMENT IN HYDRAULIC IELEVATORS.

Specification forming part of Letters Patent No. 172.896, dated February 1, 1876; application filed December 17, 1875.

To all whomit may concern Be it known that I, TIMOTHY STEBINs, of Boston, Massachusetts, have invented certain new and useful Improvements in Hydraulic Elevators, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings making a part of this specification, in which- Figure lis a perspective view of my hydraulic device. Fig. 2 is a vertical section of the same. Fig. S5 is the same, showing the main piston rising. Fig. 4 is the same, showing the auxiliary piston brought .into action. Fig. o is a horizontal section, showing the inlet-pipes.

My invention relates to that class of elevators in which hydraulic pressure is used, and the main object sought to be secured is economy in the use of water. My invention consists in the combinations of thedevices hereinafter explained and claimed. l

To enable others skilled in the art to make and use my invention, I will proceed to describe the exact manner in which l have carried it out.

In the drawings, A represents the outer casing or cylinder, yprovided .with the inlets et a. On each side of the casing A issecured a suitable frame-work to sustain the pulleys 1 A l and 2 2. From this framework rises the vertical guides B I/ for the .cross-head C. Within the cylinder A works the hollow piston D, the upper portion. of which is connected by suitable means to the cross-head C. Again, within the hollow piston D is a stationary hollow cylinder, E, secured to the bottom of cylinder A. Thus the piston D moves and operates between the interior of the cylinder A and the exterior .of the cylinder E, for purposes hereinafter explained. Again, within the cylinder E is itted to operate the piston F, having a hollow piston-rod, f, reaching nearly A to the top of the cylinder E. Aga-in, within the hollow piston-rod or cylinder fis snuglytted and operated the piston G. This hollow rod or cylinder f is provided with a valve, g, at its bottom, for a purpose hereinafter explained. Attached to the piston G is the piston-rod I, the opposite or upper end of which is connected with the cross-head C by Through the base of required.

piston D, and supplies the water for raising` that piston. The opening a enters the cylinder A immediately under the piston F, and

supplies the water for raising that piston. The pipes conducting the water to the openings a and 4amay be supplied with'dischargecocks of any of the Well-known styles.

The operation of my device is as follows:

The elevator being ready to ascend, water is` admitted through the opening a, and the pressure raises the piston D, and with it the piston- ,rod I, both being connected with the cross head O. The result will be the equal ascent of the pistons D and G. As the piston G' rises in the hollow rod or cylinder f, the dead water restingin pipe below the cock enters through the valve geand opening g into and iills the cylinder f. Let us suppose. the elevator has reached the third floor of the building, and some additional weight is added to the load, and the main piston D is unable to rise farther. Water is admitted through the opening a and und'er the piston F. This piston then rises, and as the valve g closes and prevents the escape of the water from under the piston G, the piston F carries with it the piston G and piston'rod I, and an additional power is thus added to the piston D to aid in raising the elevator. By this construction it is evident that I am able to bring the auxiliary piston F into immediate actionwhen needed. It remains in position to receive the hydraulic pressure, while the pistoin G and rod I move up with the piston D, and practically become an elongated rod to the piston F, ready to catch the pressure and come to the aid of piston, D whenever additional aid is It is evident` from the above description that, instead of the stationary hollow cylinder E, a moving cylinder could be used with a piston fitting in the cylinderA andv that the number of cylinders and pistons may be increased without departing from the spirit of my invention. Any well-known arrange ment of supply and exhaust cocks may be used. When the exhaust-cocks are opened the pistons will all gradually descend, and when the piston F reaches the bottom of cylinder E, the valve g will be raised from its seat and opened by the short rod i, and the piston Gr will be allowed to continue its descent until it reaches the bottom of the cylinder f.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a hydraulic elevator, the hollow cylinders A and E, iu combination with the hollow piston D and cross-head C, substantially asl and for the purpose described.

2. In a hydraulic elevator, the hollow cylinders A and E and hollow piston'D, in combination with the pistou lF and cross-head C, substantially as and for the purpose set forth.

3. In a hydraulic elevator, the hollow cylin-y 

